Dream as a second life
Nerval opens by asserting that dream is a second life, entered through a gate of ivory or horn, in which the self goes on existing in another form. Madness, on his account, is what happens when this second life spills into waking hours: 'the overflowing of dream into real life.' The same visions that sleep keeps separate from the day stop being contained, so the sufferer does not experience delusion as error. He experiences it as the dream world becoming continuous with the waking one.
